Theodore g



T. G. LEWIS.

LUBRIGATOR.

(N0 Model.)

No. 545,598. Patented Sept. 3, 189.5.

Za/m Inventr.

Attorney'.

UNITED STATES PATENT OFFICE.

THEODORE G. LEWIS, OF BUFFALO, NEW YORK, ASSIGNOR TO THE BUFFALO rDENTAL MANUFACTURING COMPANY, OF SAME PLACE.

LU BRICATOR.

SPECIFICATION forming part of Letters Patent No. 545,598, dated September 3, 1895.

Application filed February 4, 1895. Serial No.*53'7,152. (No model.)

To @ZZ whom t may con/cern:

Be it known that I, THEODORE G. LEWIS, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Lubricators, of which the following is a specification.

This invention relates to that class of lubricators whichl consist, essentially, of a screwthreaded stem having an oil-duct and a cap or cylinder inclosing the stem.

My invention has for its object to produce a lubricator of this kind in which dust and grit are effectually excluded from the oil-duct,

and which comprises a minimum number of parts, so that it can be manufaeturedat small cost.

In the accompanying drawings, Figure l is a sectional elevation of my improved lubricator on an enlarged scale, showing the cap depressed for covering the oil-duct. Fig. 2 is a similar view showing the cap raised for eX- posing the oil-duct. Fig. 3 is a cross-section of the lubricator in line 3 3, Fig. l, looking upward. Fig. 4 is a sectional elevation of a modified construction of the lubricator.

Like letters of reference refer to like parts in the several figures.

A is a cylindrical stem or stud which is provided at its lower end with an external screwthread o. for Yattaching it to a bearing B or other part to be lubricated. This stem is formed at its upper end with a Bange or head c, and in its lower portion with an oil duct or passage d, which extends upward from the inner end of the stem, and thence laterally to the surface thereof. A

E is a cap or cylinder which surrounds the stem, and which is longitudinally movable thereon, so that it may be raised for exposing the inlet end of the oil-duct. The bore of this cap is of about the same diameter as the flange of the stem, so as to leave an annular space between the cap andthe stem below 'said flange. annular space around the stem A, and bearing at its upper end against the flange of the stem and at its lower end against an annular flange e, projecting inwardly from the lower end of the cap E. This spring tends tode- F is a spiral spring arranged in this the stem and be wiped into the duct by the movements of the cap. The cap is preferably closed at its upper end by a disk e', which rests upon an internal annular shoulder e2, formed near the upper end of the cap, and which is confined in place against said shoulder by a lip e3, formed by bending the upper edge of the cap inward over the disk, as sbown i in Fig. 1. A This lip may be formed by burnishing or by any other suitable means. The upper edge of the cap is straight before the disk is inserted, as shown by dotted lines in v Fig. l.

In assembling the parts of the lubricator the spring isA first placed upon the stem, and these parts are then placed into the cap through its open top, after which the disk is inserted in the upper end of the cap and secured in place. If desired, the cap may consist of a cylinder open at both ends, as shown in Fig. 4.. In this case the upper end of the cap is closed by the flanged upper end of the 'stem when depressed, and is open when raised to uncover the oil-duct.

In my improved lubricator the spring is subjected to compression strain, and it' is therefore not liable to become set or overstrained.

The peculiar construction of the lubricator enables it to be made of very small dimensions, rendering it especially advantageous for bicycles and other machines in which a small and light lubricator is desired.

I claim as my invention- 1. The combination with a stud or stem provided at its upper portion with a projecting flange and in its lower portion with an oil duct, of a cap or cylinder inclosing said stem and' provided at its lower portion with an inwardly extending ange, and a spring arranged between the cap and the stem and bearing at its end of said cylinder and eonned between said shoulder and said lip, and a spring surrounding the stein between the anges ofthe cap and. the stern, substantially as set forth.

Witness my hand this lst day of February, 1895.

THEODORE G. LEWIS.

Witnesses:

J No. J. BONNER, KATHRYN ELMORE. 

